Infrared line plummet

The utility model discloses an infrared line plummet, and belongs to the field of tools. The line plummet comprises a hanging portion and a plummet portion, cylindrical cavities are formed in the hanging portion and the plummet portion, a battery barrel is arranged in the hanging portion, a switch is arranged in the circle center of the lower end of the battery barrel, compressing holes of a compressing rod are formed in the battery barrel and the hanging portion in the radial direction, and the compressing rod transversely penetrates in the compressing hole of the battery barrel and the compressing hole of the hanging portion. When the switch is turned off, a clearance is arranged between the compressing rod and a switch contact, an axial light hole is formed in the top end of a cone body of the plummet portion, and an infrared transmitter is arranged in the cavity of the plummet portion. Through the infrared line plummet, the precision and speed of looking for a vertical point from top to bottom can be guaranteed, construction quality and construction speed can be guaranteed, and construction convenience is provided for constructors.